It seems there is no way to add certificates in the standard mail app, which makes my private mail server useless.
How do I add the CaCert root certificate in my Firefox Phone?
At the moment, when I try to connect to my server I get the error
warning: TLS library problem: 15511:error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca:s3_pkt.c:1261:SSL alert number 48: